Estimate pipe, gravel, fabric, and total cost for a French drain installation. Compare DIY and professional pricing.
Need to plan your drain path? View your yard on satellite imagery with LotSite →
DIY vs professional installation costs for standard 4-inch drains.
| Length | Gravel Needed | DIY Cost | Pro Cost |
|---|---|---|---|
| 25 ft | 0.7 cu yd | $100 | $550 |
| 50 ft | 1.4 cu yd | $199 | $1,100 |
| 75 ft | 2.1 cu yd | $299 | $1,650 |
| 100 ft | 2.8 cu yd | $399 | $2,200 |
| 150 ft | 4.2 cu yd | $598 | $3,300 |
| 200 ft | 5.6 cu yd | $798 | $4,400 |
A French drain is a gravel-filled trench with a perforated pipe that collects and redirects water away from problem areas. It is one of the most effective solutions for wet yards, soggy spots, and foundation drainage issues.
The key to a successful French drain is proper slope. The trench must slope at least 1 inch per 8 feet (1 percent grade) toward the outlet point. Use a laser level or string level to verify consistent slope before laying pipe. The outlet can be a dry well, a storm drain, or a lower area of your property.
Use LotSite to plan your drain path on satellite imagery. Viewing your property from above helps you identify the best route from the problem area to the outlet point, and estimate the total length needed.
Enter your address to view your yard and plan the best drain route.
Also check out our gravel calculator and retaining wall calculator